An Illinois motor vehicle bill of sale documents the purchase and sale of a motor vehicle between a private seller and buyer in the State of Illinois. An Illinois Trailer Bill of Sale is a legal document that records the release and acquisition of ownership for a trailer.Motor Vehicle (DMV) Bill of Sale Form Affirms the information contained in a transaction of a vehicle for a payment amount. Attaching a copy of the bill of sale or proof of purchase to Form RUT-50 may prevent future notices. Forms on this website are PDFs with fillable fields. Forms should be downloaded to your computer before filling in the fields. There is no issued DMV bill of sale form in the State of Illinois. You should attach a copy of the bill of sale as proof of the purchase price. Seller certifies that to be the legal and true owner of the Trailer and is to be sold in "as-is" condition. Check out our trailer for sale selection for the very best in unique or custom, handmade pieces from our camping shops.